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Location:
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Latitude: , Longitude:
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General location information:
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North, Central, and South Oregon Coast, Pacific Northwest, USA
HAB Area code(s): US-22
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Additional location information:
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Includes shellfish habitat on monitored beaches and bays along 400 miles plus of Oregon coastline; North region - Clatsop and Tillamook counties; central region - lincoln and lane counties and south region - Douglas, Coos, and CUrry counties.
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Bloom event dates (yyyy/mm/dd):
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Quarantine levels dates (yyyy/mm/dd):
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Additional date-related information:
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There were apparently no Pseudo-nitzschia blooms which increased domoic acid to quarantine levels in Oregon shellfish during 2007. This report provides follow-up information about domoic acid concentrations seen after 2005 - 2006 toxin producing events.
North region - Domoic Acid was present at less than quarantine levels in north coast razor clams when 2007 began, still declining from a July 2006 event when DA levels reached 31 ppm in razor clams. DA levels were < 5 ppm in razor clams by May of 2007, no DA was detected in north coast mussels. Phytoplankton monitoring identified a significant bloom of predominantly the smaller Pseudo-nitzschia spcies, (delicatissima and pseudodelicatissima) in May 2007, 460K cells per liter.
Central region - DA was presetn at less than quarantine levels in central coast razor clams when 2007 began, still declining from a July 2006 event when DA levels reached 20 ppm in razor clams. DA levels were < 5 ppm in razor clams by May of 2007. Phytoplankton monitoring identified a significant bloom of predominantly the smaller Pseudo-nitzschia species, (delicatissima and pseudodelicatissima) on Lane Co. beaches in June 2007, 731K cells per liter.
South Region - DA was present at less than quarantine levels in south coast razor clams when 2007 began, apparently still declining from a 2005 event when DA levels reached 190 ppm in south coast razor clams. Sparse razor clam populations on the south coast make sampling difficult. DA levels were <10 ppm in razor clams by July of 2007. DA levels were not detected in other clams, mussels, or oysters. Phytoplankton monitoring did not identify any large bloom events of Pseudo-nitzschia on the south coast in 2007.
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